Fuller Tool 421-1381 Pro 11 Piece 1/4-Inch to 7/8-Inch Combination Wrench Set Chrome vanadium steel for strength and durability with a full polish chrome finish for a professional look and feel Heat treated for consistent hardness 12 point box end for snug fit and precision broached jaws for sure gripping Thin walled construction for access in cramped quarters Industrial and professional quality, built-to-last